ANNIVERSARY ADDRESS OF THE PRESIDENT. 



205 



The British Devonian flora is small, including only 12 genera and 

 18 species, as stated in the Devonian table. The American 

 genera and species of the Carboniferous flora number, according to the 

 published lists &c, 94 genera and 695 species ; and the European 

 Carboniferous flora, including the British, 176 genera and 1370 

 species ; the species occurring in the S divisions of our Carboniferous 

 strata number 339, illustrating 84 genera. The stratigraphical 

 distribution is as follows : — 



Calciferous Sandstone .... 



10 genera and 12 s - 



Lower Limestone Shale . . 



22 



st 



41 



Carboniferous Limestone . . 



'. '. 13 



)j 



22 







?> 



none 



Millstone Grit 



10 



» 



27 





51 



jj 



211 





34 



Ji 



128 



Upper „ 



33 



jj 



163 



Ten genera are largely represented in Britain, and contain 192 

 species out of the 339, forming the whole flora : they are Alethojoteris 



9 species, AsUrophyllites 11, Catamites 14, Lepidodendron 21. Lejoido- 

 strobus 15 (but for the number given, these cones of Lepidodendron 

 should be taken as that genus ; probably we may never know to what 

 species of Lepidodendron all these Lepidostrobi belong), Xeirrojpteris 

 23, Pecopteris 28, Sigillaria 27, Sphenopteris 32, TJlodendron 12. All 

 the Alethopterides are from the Coal-measures. The Asterophyllites, 

 with two exceptions (A. foliosus and A. longifolia), are also Coal- 

 measure fossils. The Catamites range from the Calciferous Sandstone 

 to the Upper Coal-measures — 4 species, C. cannceformis, Schloth., 

 C. cultranensis, Haught., C. dubius, Artis, and C. Lindleui, Sternb., 

 occurring in and below the Carboniferous Limestone ; the remaining 



10 are Coal-measure forms and mostly belong to the Lower series. 

 The 21 species of Lepidodendron, with 5 exceptions, are all from 

 the Coal-measures, as are 13 of the 15 Lepidostrobi : 2 species 

 (L. comosus, L. & H., and L. variabilis, L. & H. ) are Lower Limestone 

 Shale species. With one exception in the genus Neuropteris (JST. 

 Loshii), the species are from the Coal-measures ; although we know 

 that N. cordata, X. jiexuosa, and AT. gigantea are MiUstone-Grit 

 forms. iSo Pecopteris is known below the Lower Coal-measures ; 

 therefore the large number of species (28) are essentially Upper 

 Carboniferous. Of the 27 species of Sigillaria only 2 occur below the 

 Lower Coal-measures, viz. S. dichotoma, Haught., and S .pacing derma, 

 Brongn., which occur in the shales at the base of the Carboniferous 

 Limestone. 3 species of SjoJienojoteris (S. ajjinis, S. linearis, and S. tri- 

 foliata) range from the Calciferous Sandstone to the Coal-measures ; 

 4 others (S. bifida, L. & H., S. crassa, L. & LL, 8. elegans, Brongn., 

 and S. obovata) occur in the Carboniferous shale and limestone ; 

 the remaining 25 species irregularly range through the Lower, 

 Middle, and Upper Coal-measures. TJlodendron minus and U. par- 

 matum range from the Carboniferous shale to the Upper Coal- 



